The right-hand harpsichord part is actually quite simple; the tracking
session on the box set (in C; the released version was sped up to Db)
shows it to be:

Em Esus Dsus
/ / / / / / / /

... where Em is voiced as B-E-G, Esus as B-E-A, Dsus as A-D-G. Tranpose
accordingly to play along with the sped-up version, and no, don't ask me
how to replicate these voicings on guitar - try Ab6 and Gb6 instead.

Verse 1:

Fm/Ab Fsus/Ab Ebsus/Db
Where did your long hair go
Fm/Ab Fsus/Ab Ebsus/Db
Where is the girl I used to know
Fm/Ab Fsus/Ab Abm7 Abm7/Db Gbmaj7/Db
How could you lose that happy glow
Ebsus/Gb
Oh Caroline, No

Verse 2:

Who took that look away
I remember how you used to say
You'd never change, but that's not true
Oh Caroline, you